Malicious PDF — malware analysis report

Static analysis result for SHA-256 e799877b718ca745…

MALICIOUS

PDF

86.9 KB Created: 2021-08-27 23:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89d947ed4206bf8ee2b6eca665623450 SHA-1: 6ef26c4d6eee44a4df67dbe446c70f31a2968105 SHA-256: e799877b718ca7452b354f307c025b609a1d52e7b63f91f8c52d5ef3a8d65b6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The primary function appears to be redirecting users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=motivational+good+thoughts+in+marathi PDF link annotation
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e99348ea8d---maduzaxix.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161147dafb64bd---61350763083.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/85190742834.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/40242756076.pdfIn PDF document text
    • http://goref.ru/files/file/waxaxusa.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/13236394972.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/werotojanevogokoxagusuteb.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/eff6a6e23f77655153b79d8744ed2953/67799480782.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210630143622_wfhhs0.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/24865309915.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/32e2906d98b2754cf85a4a8eb880189b/67192337944.pdfIn PDF document text
    • http://imosa.asia/uploads//files/202108041935075068.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cdcbc444f---jakexefawiribez.pdfIn PDF document text
    • https://melz-feu.ru/upload/bujiwudu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e32952bb1---fimugimorujugoremokika.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/kumufupokisi.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/wugoserogolukunamoralaso.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/87225901011.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed6748c873---nizuvirodifewuzemu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/seuloh2qau5hiv602306im82b7/22124449047.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af67c2ac8b---sasipidirupubozedunoved.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 10720 bytes
SHA-256: 90f6a8cb8a8948e6ccf519990276a796acab98ccdd71a92e442a492c35d6cf04
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 20552 bytes
SHA-256: 515a48cf312acad36584fc7c0a773a902556020af85e0f703f7672204a859259

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